I know some campgrounds do not allow firewood to be brought in. I have seen some folks bring it in and leave it in the truck till they burn it in the fire pit. One guy even started a fire with Kingsfo...
The last site I bought wood from was imported to south Texas from Oklahoma. I bring my own from my yard that I cut and aged with no bugs or mold. Also we usually camp within 150 miles of home so most likely our area is already covered.